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| All Patents in class 30/420 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,759,345 | May 20, 1930 | R.T. Chase | Can Opener | can and jar openers | |
| 2,718,055 | Sep. 20, 1955 | M.C. Frins | Can opener | combination cork extractors | |